# Questions Asked onOctober 12, 2012

1. ## physics

A particle is projected from ground in a vetical direction at t=0 sec. at t=0.8 s, it reaches h=14m .It will again come to the same height at ?

2. ## physical sicence

If a force gives a 2-kg object an acceleration of 1.6 m/s2, what acceleration does this same force give to an 8-kg object?

3. ## Physics

A uniform meter stick balances on a fulcrum placed at the 40 cm mark when a weight W is placed at 30 cm mark. What is the weight of the meter stick? How to calculator it ?

4. ## chemistry

In a 1.0x10^-4 M solution of HClO(aq), identify the relative molar amounts of these species:HClO, OH-, H3O+, OCl-, H2O

5. ## Physical Science

You submerge 100 grams of steel in 200 grams of water. If the steel has an initial temperature of 80°C and the water has an initial temperature of 10°C, what is the final temperature of the system? The specific heat capacity of the steel is 0.15

6. ## physics

A skier starts from rest at the top of a hill that is inclined at 9.5° with respect to the horizontal. The hillside is 225 m long, and the coefficient of friction between snow and skis is 0.0750. At the bottom of the hill, the snow is level and the

7. ## physics

The aircraft has a take-off mass of 320 000 kg. Each of the 4 engines can produce a maximum force of 240 kN. calculate the maximum acceleration of the aircraft. the answer is 3m/s^2 but i don't know how to get it.

8. ## physics

a roller whose diameter is 20 in weight 72 lbs. what horizontal force is necessary to pull the roller over a brick 2 in high when (a) the force is applied to the center, (b) at the top

9. ## Physical Science

A 100 kg sample of a metal is cooled from 100°C to 20°C by removing 20 kcal of heat. Calculate the specific heat capacity of the metal.

10. ## algebra 2

A car enters an interstate highway 15 mi north of a city.The car travels due north at an average speed of 62.5 mi/h.Write an equation to model the car’s distance d from the city after traveling for h hours. Graph the equation

11. ## Physics

On an aircraft carrier, a jet can be catapulted from 0 to 155 mi/h in 2.00 s. If the average force exerted by the catapult is 5.53×106 N what is the mass of the jet?__________ kg

12. ## math

an object is thrown upward from the top of a 80-foot building with a initial velocity of 65 feet per second. The height h of the object after t seconds is given by the equation h=-16t2+64t+80. when will the object hit the ground

13. ## Physical Science

A 100 kg sample of a metal is cooled from 100°C to 20°C by removing 20 kcal of heat. Calculate the specific heat capacity of the metal.

14. ## Physics

A uniform meter stick balances on a fulcrum placed at the 40 cm mark when a weight W is placed at 30 cm mark. What is the weight of the meter stick? How to calculator it ?

15. ## math

Find a. fog b. gof c. fof d. gog for each function f(x)=4-x g(x)=3x-5

16. ## statistics

Five percent of all items sold by a mail-order company are returned by customers for a refund. Find the probability that of two items sold during a given hour by this company both will be returned for a refund (round to four decimal places).

17. ## chemistry

What is the mass (in grams) of 9.81 × 1024 molecules of methanol (CH3OH)?

18. ## Chem

Arrange the following atoms in order of increasing size from smallest to largest. Phosphorus Fluorine Chlorine Sulfur

19. ## physics

A 74-kg fisherman in a 124-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 4.4 m/s as in the figure below. Neglecting water resistance, and assuming the boat is at rest before the package is thrown, find the

20. ## geometry

Write a two-column proof. Given: 7y = 8x – 14; y = 6 Prove: x = 7

21. ## math

Find three brands of a grocery item that you purchase and figure the price per unit (i.e., per ounce or pound) for each brand. Provide the item and for each brand of the item the bulk cost, unit quantity, and unit cost.

22. ## Math

An invoice of \$12,000 is dated April 5. The terms 5/10,n/30 are offered. Find the amount due if the discount is earned. Show your work.

23. ## physics

Children in a tree house lift a small dog in a basket 4.90m up to their house. If it takes 201J of work to do this, what is the combined mass of the dog and basket?

24. ## Math

How do you find the three ordered pairs that satisfy this equation Y = 3x - 4. How do you graph the line Y = 5x - 4. How do you graph X = 3.

25. ## fin 3030

2. A new common stock issue paid a \$1.50 dividend last year. The par value of the stock is \$25, and earnings per share have grown at a rate of 3% per year. This growth rate is expected to continue into the foreseeable future. The company maintains a

26. ## Physics

A ball acquires a horizontal speed of 12m/sec when a force is applied for a distance of .50m. If the ball has a mass of 1.0kg what is the force applied? ANSWER: 144N....I'm not sure what formulas I'd apply. It takes a force of 109N to life a stone straight

27. ## chemistry

in a reaction of 3Cu(s)+ 8HNO3(aq)¨ 3Cu(NO3)2(aq) +2NO(g) + 4H2O(l). if 5.58 grams of Cu(no3)2 is made how many grams of nitrogen monoxide is present

28. ## Physics

Which direction (Eastwards or Westwards) in the sky would the Sun appear to move as seen by a stationary observer on the surface of the hypothetical planet that has a sidereal rotation (on its axis) period of 120 days, and a revolution (around the Sun)

29. ## math

\$4500 at an interest of 5% for 2 1/2 years

30. ## General Chem

Nitrogen oxide reacts with oxygen gas to form nitrogen dioxide (NO2). In one experiment 0.866 mole of NO is mixed with 0.503 mole of O2. Calculate the number of moles of NO2 produced

31. ## physics

The aircraft has a take-off mass of 320 000 kg. Each of the 4 engines can produce a maximum force of 240 kN. calculate the maximum acceleration of the aircraft.

32. ## physics

A skier of mass 74 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 90 m up a 30° slope (assumed frictionless) at a constant speed of 3.0 m/s? J (b) What power (expressed in hp) must a motor have to perform this

33. ## Physics

From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 9.40 m/s and angle of 23.0° below the horizontal. It strikes the ground 5.00 s later. By how much does the ball clear or fall short (vertically)

34. ## physics

When you take your 1200 kg car out for a spin, you go around a corner of radius 54.5 m with a speed of 16.2 m/s. The coefficient of static friction between the car and the road is 0.95. Assuming your car doesn't skid, what is the force exerted on it by

35. ## Fundamentals of Contempary Management

A firm has an opportunity to invest in a new device that will replace two of the firm's older machines. The new device costs 570,000 dollars and requires an additional outlay of 30,000 dollars to cover installation and shipping. The new device will require

36. ## chemistry

For the diprotic weak acid H2A Ka1=2.1x10^-5 and Ka2=5.5x10^-7. What is the pH of a 0.0800M solution of H2A? What are the equilibrium concentrations of H2A and A^2- in this solution?

37. ## Calculus

suppose y=√(2x+1), where x and y are functions of t. a)if dx/dt=3, find dy/dt when x=4 b)if dy/dt=5, find dx/dt when x=12

38. ## science

A 10 centimeters cubed sample of salt having a mass of 8 grams is added to 20 centimeters cubed of water having a mass of 15 grams. What is the mass of the mixture?

39. ## physics

A crystalline solid consists of atoms stacked up in a repeating lattice structure. The atoms of a crystal reside at the corners of cubes of side L = 0.200 nm. One piece of evidence for the regular arrangement of atoms comes from the flat surfaces along

40. ## math

Integrate Sin(rootx) wrt x

41. ## chemistry

copper metal reacts with nitric acid. assume that the reaction is 3Cu(s) + 8HNO3(aq) ——> 3Cu(NO3)2(aq) + 2NO(g) + 4H2O(l). if 5.58 grams of Cu(NO3)2 is obtained, how many grams of nitrogen monoxide would have formed

42. ## chemistry

A gas is confined to a cylinder under constant atmospheric pressure, as illustrated in the following figure. When the gas undergoes a particular chemical reaction, it absorbs 825kJ of heat from its surroundings and has 0.62J of work done on it by its

43. ## mathe

wie heisst die kleinste siebenstellige zahl,wenn keine ziffer mehr als zweimal vorkommen darf

44. ## chem1 WORD PROBLEM!!

lead has an atomic number of 82;iron has an atomic number of 26; and copper has an atomic number of 29.how do the charges of the nuclei of these 3 elements compare?

45. ## thermodynamics and kinetics

One mole of an ideal gas undergoes an isothermal reversible expansion, doing 1 kJ of work and doubling the volume. What is its final temperature? How much heat was added to the gas?

46. ## ?

How do you become a tutor on Jiskha Homework Help

47. ## Science/C

A 250 gram sample of metal is warmed from 50°C to 90°C when 100 calories of heat are added. What is he specific heat capacity of the metal?

48. ## rounding decimals

what is 3.65 rounded to the nearest hundreth?

49. ## phy

A stone is thrown upward from the edge of a cliff overlooking the ocean. The initial speed of the stone is 20m/s, and it's thrown up at an angel of 30 degrees with respect to the horizontal. the cliff is 45m above the ocean surface. How long is the stone

50. ## Statistics

A total of 16 mice are sent down a maze, one by one. From previous experience, it is believed that the probability a mouse turns right is .38 a) What is the probability that exactly 8 of these 16 mice turn right? b) What is the probability that 8 or fewer

51. ## science

Suppose that the 1.3 km span of the Golden Gate Bridge had no expansion joints. Calculate how much longer the bride would be if the temperature of the bridge increases by 35°C.

52. ## physics

A block of mass 2.50 kg is pushed 2.80 m along a frictionless horizontal table by a constant 12.0 N force directed 25.0° below the horizontal. (a) Determine the work done by the applied force. J (b) Determine the work done by the normal force exerted by

53. ## ece

discuss the common behaviors a teacher may seein young children and target for modfication or replacement. Propose possible functions for each of these common targeted behaviors

54. ## Physics

Help a constant force equal to (5i+2j)N moves a particle through a displacement S=(2i+3j). Calculate the workdone by the force. At what angle to the horizontal was the force applied?

55. ## physical science

suppose you want to heat 40g of water by 20c.how many joules of heat are required

56. ## chemistry

compare the emission color of lithium to that of potassium .what can you conclude about these two elements and the energy levels that their electron transition?

57. ## Trig

Let f and g be two invertible functions such that f^-1(x)=5/x+4 and g(x)=4(x-2). Find f(g(5)). Show your steps please so I can see how to do it. Thank you! :)

58. ## Let f(x)=11/x+7 with the domain [-2,3]. Find the d

Let f(x)=11/x+7 with the domain [-2,3]. Find the domain of f^-1.

59. ## Math

Find (fog)(2) f(x)=Squareroot 4-x; g(x)=1-3x^2 Find (gof)(-2) for the same problem.

60. ## math 5

name two numbers with decimal hundredth that round to the same whole number but different tenths.

61. ## Science

Please,can anybody answer this question? How osmosis and diffusion explain why cell size is small ?

62. ## chemistry

what does Planck mean when he states that energy is quantized?

63. ## trigonometry

Instead of using napier's analogies, is there any simpler alternate solutions/formulas used in solving oblique spherical triangles, especially for cases 3-5?

64. ## Life orientatio

A clear explanation of how alcoholism is a human factor that may cause ill health,accidents,crises or disaster

65. ## math

if the simple interest on \$2000 for 8 years is \$960, then what is the interest rate?

66. ## physics

A 2.1 103-kg car starts from rest at the top of a 5.9-m-long driveway that is inclined at 19° with the horizontal. If an average friction force of 4.0 103 N impedes the motion, find the speed of the car at the bottom of the driveway.

67. ## sscc

Assume that 41.0 cal of heat is applied to a 30. g sample of sulfur at 16°C. What is the final temperature of the sample if the specific heat of sulfur is 0.175 cal/(g·°C)?

68. ## English1C

I need help writing a fallacy essay about The Wrong InequalityBack to Article » By DAVID BROOKS

69. ## Chemistry

How do we prepare 500mL of 0.5 percent w/v solution of NaOH if we have stock solution of 50 percent w/v NaOH on hand?

70. ## maths

Find the Cartesian form of the equation, r3 = 3r cosØ

71. ## science

You wish to heat 30 kg of water from 60°C to 80°C. How many kcal of heat are necessary to do this? To how many kJ does this correspond?

72. ## English1C

How to write a fallacy essay . Write purpose of the article including name, title, author, and say if you think the article is strong or not . We live in a polarizing society, so perhaps it’s inevitable that our experience of inequality should be

73. ## physics

a roller whose diameter is 20 in weight 72 lbs. what horizontal force is necessary to pull the roller

74. ## French

ils regardent les vetements pour hommes dans _______ de la boutique

75. ## math repost

name two numbers with decimal hundredth that round to the same whole number but different tenths.

76. ## math

Draw 3 arrays to show that 20 is a multiple of 2, 5, and 10.

77. ## writing

I have to write an essay about how Morrison uses power stuggle in Beloved to enhance the meaning of her work. I think I have some idea, but I'm just sitting here numberless. This essay is due in about 2 days. Can you help me ASAP? Thanks

78. ## Algebra 2

A company placed \$1,000,000 in three different accounts. It placed part in short term notes paying 4.5% per year, twice as much in government bonds paying 5%, and the rest in utility bonds paying 4%. The income after one year was \$45,500. What are the

79. ## algebra

solve 8x+4=3x+8

80. ## MATH

32 + (5 - 2) · 4 -

81. ## Pacific Island

How did physical features affect migration and the distribution of culture groups in the Pacific Island Region?

asked by rawr... im a dinosaur.... rawr
82. ## algebra

3x - 6y + 2z - 5x - 3y + 8z

83. ## physics

A toy cannon fires a .11 kg shell with initial velocity vi=10m/s in the direction 52 degrees above the horizontal. The shell's trajectory curves downward because of gravity, so that time t=.61 s the shell is below the straight line by some vertical

84. ## Chem

Hello! A 22.0 L cylinder containing helium gas at a pressure of 28.1 atm is used to fill a weather balloon in order to lift equipment into the stratosphere. What is the final pressure (in atm) in the cylinder after a 101 L balloon is filled to a pressure

85. ## physics

A 1,440-N crate is being pushed across a level floor at a constant speed by a force vector F of 380 N at an angle of 20.0° below the horizontal, as shown in the figure (a) below. (a) What is the coefficient of kinetic friction between the crate and the

86. ## Physics

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.50 x 105 kg, its speed is 27.0 m/s, and the net braking force is 4.73 x 105 N. (a) What is its speed 7.50 s later? (b) How far has it traveled in this time?

87. ## Physics

A car with a mass of 1797 kg is moving to the right at a constant velocity of 2.50 m/s. What is the net force acting on the car?

88. ## Physics

A 2.7 kg bucket of water is raised upwards by a rope. If the bucket has an acceleration of 3.4 m/s/s, find the force exerted by the rope on the bucket.

-13 + 20

90. ## Algebra

How do the solutions of the equation compare to the length of the rectangular object and the x-intercept of the graph? Provide both the solutions and measurement. x^3-10x^2+21x -108 = 0 Length: 9 inches Height: 6 inches Width: 2 inches

91. ## math

When a polynomial is divided by (x+2), the remainder is -19. When the same polynomial is divided by (x-1), the remainder is 2. Determine the remainder when the polynomial is divided by (x-1)(x+2).

92. ## ALGEBRA

3 − 24 ÷ 8 + 42

93. ## chemistry

A sample of one liquid has a mass of 60 grams and a volume of 50 centimeters cubed; a sample of a second liquid has a mass of 30 grams and a volume of 40 centimeters cubed. They are put in a container and mixed. Can you determine what the mass and the

94. ## science

40 centimeters cubed of dry sand is added to a graduated cylinder containing water, the level of the liquid rose 15 centimeters cubed on the scale. What is the volume, in centimeters cubed of air in the sand?

95. ## science

Explain how to measure the volume of a rock by water displacement?

96. ## Science

what is solubility of NaOH at pH 5.5 and 8.0 when Ksp for NaOH is 5x 10^-10

97. ## Science

calculate the solubility of NaCl in a solution which contains 0.1 M CaCl2

98. ## fin 3030

1. A bond has a \$1,000 par value (face value) and a contract or coupon interior rate of 8%. A new issue would have a flotation cost of 5% of the market value. The bonds mature in 10 years. The firm’s average tax rate is 28% and its marginal tax rate is

99. ## math

Line BD bisects

100. ## Math (algebra)

I have no idea how to solve this problem... A village wants to build a community center that is projected to cost 1.2 million dollars. Cost per resident is increased by #\$ as it is discovered that there are 225 fewer residents than when planning began 2

101. ## SS8R

What is the Cattle Kingdom?

102. ## Poetry check?

So I'm doing a project called Equality Matters. I decided to try and use my writing abilities to help me. Can you check this poem? To Be Who You Are Meant To Be: Equality Matters People tell me to be who I want And to be what I need So whats wrong if I'm

asked by rawr... im a dinosaur.... rawr
103. ## math

solve equation a + 10 = 7.9

104. ## physics

four particles each of mass 1kg at rest of four corners of a square as shown in the fig . find the coordinates of the mass of the system

105. ## math

The question is 24 (-6)-1/-5 I don't understand what you do with the 24. I got -145/-5=29 I multiplied 24 by -6 but I don't think this is right there is a big space between the 24 and the other numbers.

106. ## PreCal

Simplify using identites tan(-x)cosx

107. ## stats

blood cholesterol level of all men age 20-24 follows N(188,41) where the units for the men and standard deviation are in mg/dl. what is the probability that the sample mean takes a value between 185 and 191 if we sample 1000 men

108. ## maths

5/1/4+2/1/4+1/8

109. ## Chemistry

List commercial, everyday products whose manufacture starts with ethylene or ethene. I have already listed down plastic bags and milk containers. Could petrol be one of them?

110. ## maths

7/1/2-1/1/8-2/1/5

111. ## physics

how do i find the net force 30-N and a force 20 to show forces opposite and both in the same diection?

112. ## Chemistry

Question as follows: 75.0g tartaric acid in 1 Liter is what molarity(moles/liter) mw=150.087 g/mol M1= 25 ml tartaric solution is titrated with 31 ml ammonium. What is the equation rearanged for normality of ammonium: starting with N1V1=N2V2 N1= V1= V2=

113. ## physics

The satellite is in a circular orbit 400 km above the Earth's surface, where the free-fall acceleration is 8.71 m/s2. The radius of the Earth is 6400 km. Determine the speed of the satellite.

114. ## MBA

Q3. Select a company of your choice in a sector that you would like to work in. Imagine that you have to make a brief presentation on this company to business school students. Develop – (a) A general and specific statement of purpose (b) The key idea (c)

115. ## accounting

Lisa school supplies suffred a fire loss. The company needs to estimate the cost of good destroyed. Beginning inventory was 100,000 purchases totaled 600,000 and sales came equaled 1,000,000. Lisa normal gross profit percentage is 40%. What is the

116. ## physics

A skier starts from rest at the top of a hill that is inclined at 9.5° with respect to the horizontal. The hillside is 225 m long, and the coefficient of friction between snow and skis is 0.0750. At the bottom of the hill, the snow is level and the

117. ## organic chemistry II lab NMR

Why do we only see four peaks in the 1H NMR when we have five CH2 groups and 2 OH groups? Answer a. There should be more peaks, but they peaks are overlapping in the spectrum. b. Heptanedioic acid is a symmetrical molecule. c. Heptanedioic acid is a chiral

118. ## Chemistry

Calculate the amount of heat in joules required to heat 43 grams of water from 28 degrees celcius to the normal boiling point 100 degrees celcius

119. ## Algebra 2

A company placed \$1,000,000 in three different accounts. It placed part in short term notes paying 4.5% per year, twice as much in government bonds paying 5%, and the rest in utility bonds paying 4%. The income after one year was \$45,500. What are the

120. ## NMR Organic Chemistry multiple choice

Why do we only see four peaks in the 1H NMR when we have five CH2 groups and 2 OH groups? Answer a. There should be more peaks, but they peaks are overlapping in the spectrum. b. Heptanedioic acid is a symmetrical molecule. c. Heptanedioic acid is a chiral

121. ## mathe

wie heisst die grÃ¶sste vierstellige zahl aus lauter verschiedenen ziffern

122. ## mathe

stmmt das wenn man im hunderterfeld ein feld nach rechts springt kann sich der einer verÃ¤ndern

123. ## maths

Let ABC be a triangle in the plane. Find circles C0;C1; : : : ;C6 such that Cj has exactly j points in common with the boundary of ABC (this \boundary" consists of the line segments AB, BC, CA). Is it possible to nd a circle C7 with 7 points in common with

124. ## mathe

,,wenn man im hunderterfeld zwei felder nach unten springt ,verÃ¤ndert sich der hunderter um 1

125. ## mathe

was ist ein mittel wert

126. ## physics 221

Question Part Points Submissions Used An 8.61-kg block slides with an initial speed of 1.72 m/s down a ramp inclined at an angle of 27.4° with the horizontal. The coefficient of kinetic friction between the block and the ramp is 0.73. Use energy

127. ## Physics

Vector Aarrowbold points in the negative y direction and has a magnitude of 8 units. Vector Barrowbold has the same the magnitude and points in the positive x direction. Find the direction and magnitude of the following vectors. a) Aarrowbold + Barrowbold

128. ## pre-cal

find the distance d (P1 P2) between the P1 and P2 P1=(-1,1);P2=(1,2)

129. ## deutsch

um was besteht sprache

130. ## Physics

What does the tire preseeure reading in your vehicle signify? Is it an absolute pressure?

The sum of two consecutive numbers is 37. What are they?

132. ## math

A living room set lists for \$10,800 and carries a trade discount of 20 percent. Freight (FOB shipping point) of \$60 is not part of list price. The delivered price of the living room set including freight assuming a cash discount of 3 percent is:

133. ## thermodynamics and kinetics

One mole of an ideal gas at 25C and 1 bar is allowed to expand adiabatically against a constant external pressure of 1.00 bar from 1.00 dm^3 to 10.00 dm^3. Calculate the final temperature, q, w, delta_U and delta_H.

134. ## gcuf

why aceticacid is weaker than iodoacetic acid?

135. ## physics

In a game of basketball, a forward makes a bounce pass to the center. The ball is thrown with an initial speed of 3.1 m/s at an angle of 15.0° below the horizontal. It is released 0.82 m above the floor. What horizontal distance does the ball cover before

136. ## physics

This is example question If a baseball is thrown at average 24m/s and flying 12 m/s full length of the field by 0.5s example=formula How would it change if a wind cause air resistance=

137. ## physics

Snowballs are thrown with a speed of 12.5 m/s from a roof 7.8 m above the ground. Snowball A is thrown straight downward; snowball B is thrown in a direction 16° above the horizontal. (a) Is the landing speed of snowball A greater than, less than, or the

138. ## Chemistry

The volume in cubic meters of a 141541 kg blue whale?

139. ## chemistry

A certain weak base has a Kb of 9.00x10^-7. What concentration of this base will produce a pH of 10.30?

140. ## statistics - probability

A total of 16 mice are sent down a maze, one by one. From previous experience, it is believed that the probability a mouse turns right is .38 a) What is the probability that 8 or fewer turn right? b) What is the probability that 8 or more turn right? c)

141. ## science

decomposing 0.00153 moles cholesterol will release what volume of hydrogen atoms?

142. ## education

Hi! So for my education class I need to write a sample Lesson Plan. The subject/topic can be anything. Any ideas on what to write about?

143. ## literature

In what way does the setting of a small town during the Great Depression impact the characters and plot of "Gumption"? a. The characters can use their wealth to choose among many options for resolving conflicts. b. The characters are unconcerned about the

144. ## multplication

When multiplying is there a rule stating that the numbers being multiplied can't have the same two last numbers as the product or the numbers can't end with the same numbers that were multiplied?

145. ## Chemistry

To what temperature must a gas sample initally at 13 degrees be raised in order for the avarage energy of its molecules to double?

146. ## Science

How much heat is necessary to heat 100 g of water at 10°C to 95°C?

147. ## physics

why one cannot find the north pole of the earth using only a simple compass

148. ## physics

what device could use th earth's magnetic felds to produce energy and how it would work?

149. ## Chemistry

How would we make 500mL of a 1.5 percent w/v solution of KCl in water?

150. ## pysical science

an object who's mass is 5.20kg has a gravitational potential energy of 10.30kJ. How highh above the ground is the object

151. ## disease

Case Study..... Judy was 18 when the terrible crash happend. While judi was returning home from work, a driver ran a red light and smashed into the drivers side of judis car. she was unconcious when she arrived at the hospital. swelling in the brain

152. ## Math

A curve is defined by the equation x^2y^3+4x+2y=12. Find dy/dx in terms of x and y.

153. ## Math

Let y=cos x+sin x/cos x -sin x. Find dy/dx

154. ## Math

Let y=cos x+sin x/cos x -sin x. Find dy/dx

155. ## chemistry

enough of a monoprotic acid is dissolved in water to produce a 0.0111M solution. The pH of the resulting solution is 2.62. Calculate the Ka for the acid.

156. ## Math

Let y=cos x+sin x/cos x -sin x. Find dy/dx

157. ## physics

A 52-kg pole vaulter running at 12 m/s vaults over the bar. Her speed when she is above the bar is 0.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.

158. ## Chemistry

what are redox/non-redox not getting it? Can you break it down?

159. ## physics

A mass of 2.6 kg lies on a frictionless table, pulled by another mass of 4.7 kg under the influence of Earth’s gravity. The acceleration of gravity is 9.8 m/s2 .If the acceleration of the object has a magni- tude of 3.5 m/s2, what is the angle θ between

160. ## physics

If a force gives a 2-kg object an acceleration of 1.6 m/s2, what acceleration does this same force give to an 8-kg object?

161. ## physics

A 2.1 103-kg car starts from rest at the top of a 5.9-m-long driveway that is inclined at 19° with the horizontal. If an average friction force of 4.0 103 N impedes the motion, find the speed of the car at the bottom of the driveway. m/s

162. ## Computer Science(python)

Service Price Basic Lawn Mowing \$20 Trimming and Sweeping \$25 Pool Cleaning \$50 Watering Plants \$10 Prompt the user to input whether or not they want each of the services. You can assume the input will be a character that is either a 'y' or an 'n'. Print

163. ## Physics

A dog running in the +y-direction at 6.0 hears its owner call from behind, and 2.7 later it's running at the same speed in the opposite direction. Calculate the dog's change in velocity. Calculate the average acceleration

164. ## physics

A 650-kg elevator starts from rest and moves upward for 2.80 s with constant acceleration until it reaches its cruising speed, 1.64 m/s. (a) What is the average power of the elevator motor during this period? W (b) How does this amount of power compare

165. ## chemistry

a glass jar containing .27 mol of Nitrogen with a leaky lid is heated from room temperature 22 celcis to 150 celcis. How many moles of Nitrogen remain? How many gtams?

166. ## social studies

Is the Lake District in Scotland or England in the United Kingdom? Is the National Trust a government organization?

167. ## Bristsh history

Did Beatrix Potter go to school or did she learn from private tutors only?

168. ## Physics

From the window of a building, a ball is tossed from a height y0 above the ground with an initial velocity of 9.40 m/s and angle of 23.0° below the horizontal. It strikes the ground 5.00 s later. By how much does the ball clear or fall short (vertically)

169. ## English

He went on a trip. He went on a bike riding. He went on a vacation. He went on a walk. He went on a shop. He went on a hunt. He went on a fishing. He went on a drive. He went on a hike. He went on a jog. (Can we use all the expressions above?)

170. ## Math

Find the slope m of the tangent to the curve y = 3/√ x at the point where x = a > 0

171. ## Chem II

A sample of gas in a 25.0-L containter exerts a pressure of 3.20 atm. Calculate the pressure exerted by the gas if the volume is changed to 45.0-L at constant temperature.

172. ## pre-cal

Find the real zeros of f (x)= 2x^3 + 3x^2 – 8x + 3

173. ## Physics, science,

I'm desperate Please help 2. A bird, starting from rest, accelerates at 3 m/s2 north for 5 seconds. It then sees the rest of its flock and turns due east accelerating from its previous speed to 20 m/s in 2 seconds. A. What is the velocity of the bird after

174. ## Chem II

A sample of gas in a 21.5-L container at 45 degrees Celsius is cooled at constant pressure to a temperature of -37 degrees Celsius at constant pressure. Determine the volume of the cooled gas.

176. ## Physics

3. It’s fourth down in the big football game, and the game is tied with 2 seconds to go! You are called on to win the game with the biggest field goal of your life, from 36 meters. The crowd holds its collective breath as the ball is spotted, and you